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I've driven by that on I-5 a number of times. Another one that jumped out at me were the cinder cones north of St George Utah. We were driving through to go t
by davidw 3y ago
I've driven by that on I-5 a number of times.
Another one that jumped out at me were the cinder cones north of St George Utah. We were driving through to go to Zion National Park, which is not at all volcanic looking in terms of the formations, so it was quite odd to see some volcanic stuff that would look perfectly normal here in central Oregon.
- pfdietz 3y agoThat's in the Basin and Range province (most of Nevada is in this province). It's a zone of crustal extension, with the crust being pulled apart on an east-west axis. This leads to the characteristic horst and graben geography, with valleys interspersed with mountains. It also means the crust has become thinner. This has brought hot rocks closer to the surface, where some have melted due to decompression, allowing magma to flow up through all those normal faults, creating volcanism.